Publication of new CRES measurementsMarch 6, 2017
We announce the publication of a review of recent results from the Project 8 expriment, including a new measurement of 83mKr conversion electrons.. We measured the 30 and 32 keV conversion electrons with resolutions of 3.3 and 3.6 eV (FWHM), respectively. The paper was published in Journal of Physics G (J.Phys. G44 (2017) no.5, 054004), and can be found on the arXiv (1703.02037).

Publication of the CRES DiscoveryApril 20, 2015
The paper announcing the first detection of single-electron cyclotron radiation and the first application of the CRES technique has now been published in Physical Review Letters: Phys. Rev. Lett. 114, 1162501 (2015). The article was highlighted as an Editors' Suggestion. You can also read the Viewpoint commentary on the article written by Patrick Huber.

First Observation of Single Electron Cyclotron RadiationAugust 25, 2014
The Project 8 collaboration is proud to announce the first observation of relativistic cyclotron radiation from single electrons! We detect individual electrons from a gasseous 83mKr source. Since the frequency of the relativistic cyclotron radiation is inversely proportional to the kinetic energy of the electrons, we use this technique to make a spectroscopic measurement of the 83mKr internal conversion electron lines. This new spectroscopic technique is called Cyclotron Radiation Emission Spectroscopy (CRES). Please see the preprint of our paper announcing these results for more details.

Towards a Radio-Frequency Measurement of the Neutrino Mass

The Project 8 collaboration aims to measure the absolute neutrino mass using tritium beta decays and Cyclotron Radiation Emission Spectroscopy (CRES). The relativistic shift in the cyclotron frequency with electron energy will allow us to make an extremely precise measurement of the electron energies. We will measure the energy of electrons emitted from tritium beta decays, and infer the neutrino mass from the shape of the electron energy spectrum.

In 2018 we made the CRES measurement of electrons from tritium beta decays. The above image is a spectrogram showing the first tritium electron detected by the Project 8 collaboration. The horizontal axis is time, and the vertical axis is frequency. Multiple separate "tracks" are seen because the electron scatters off of gas molecules and ends up emitting cyclotron radiation at a slightly different frequency; the slope of each track indicates that the electron is losing energy to the cyclotron radiation. For more details on the discovery of CRES signals, check out the publication of our first results!

Funded by the US Department of Energy, the US National Science Foundation, the University of Washington, Pacific Northwest National Laboratory, Lawrence Livermore National Laboratory, Yale University, the PRISMA Cluster of Excellence at the University of Mainz, and the Karlsruhe Institute of Technology